Additive for papermaking
US5698627A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1996 |
| Grant date | Dec 16, 1997 |
| Priority date | — |
| Expiry date | Mar 29, 2016 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/455
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A novel additive for papermaking is disclosed. The additive comprises an aqueous solution of a copolymer obtained by reacting (a) an acrylamide, (b) a vinyl monomer which is copolymerizable with component (a) and has a cationic group, (c) at least one of vinyl monomers which are copolymerizable with component (a) and (b) and have 2, 3 or 4 carboxyl groups in a molecule thereof and/or a salt thereof, optionally (e) a nonionic monomer which is copolymerizable with components (a), (b) and (c) if desired, and (d) a cross-linking compound, in the presence of (f) at least one of ethylene glycol, diethylene glycol, diethanolamine and glycerin. This novel additive for papermaking is able to achieve excellent freeness and retention in the process of papermaking and provides paper with increased strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.